船舶辅机的隔振设计及船体耦合振动分析

Design of Vibration Isolation for Ship's Auxiliary Machinery and Analysis of Coupling Vibration with Ship Structure

为了减小船舶的振动与噪声,对某船用空压机组进行了浮筏隔振装置的设计,其中包括隔振参数的确定以及筏体结构的设计等。通过建立隔振系统的有限元模型,分析了该系统的动力学特性,包括振动模态、振动传递率以及对于冲击的响应。为了揭示实船隔振系统的规律,将空压机组浮筏装置的有限元模型拓展到全船,分析了隔振装置装船后的耦合振动模态,讨论了船舶结构的振动对浮筏系统隔振效果以及冲击响应的影响。在此基础上,探讨了提高船舶辅机浮筏隔振系统动力学性能的途径。

With the purpose of reducing the vibration and noise of the ship, a floating raft installation for ship＇ s air compressors is designed, including the determination of vibration isolator parameters, the design of raft structure. The FEA（finite element analysis） model of the isolation system is established. Its dynamic properties are investigated, including the vibration modes, vibration transmissibility and the shock response. To reveal the rule appeared in real ship, the FEA model of the floating raft installation is extended to the whole ship structure. The coupling vibration modes with the hull structure involved are obtained. The influences of vibration modes with ship structure on the isolation efficiency and shock response are investigated. The way to improve the dynamic properties of the vibration isolation system for ship＇ s auxiliary machinery is discussed.